The system is not configured to meet the minimum requirement for session security for NTLM SSP based Servers.

From Windows 2008 Domain Controller Security Technical Implementation Guide

Part of Session Security for NTLM SSP based Servers

Associated with: CCI-000366

SV-29357r1_rule The system is not configured to meet the minimum requirement for session security for NTLM SSP based Servers.

Vulnerability discussion

Microsoft has implemented a variety of security support providers for use with RPC sessions. In a homogenous Windows environment, all of the options should be enabled and testing should be performed in a heterogeneous environment to determine the maximum-security level that provides reliable functionality.

Check content

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “Network security: Minimum session security for NTLM SSP based (including secure RPC) servers” is not set to “Require NTLMv2 session security” and “Require 128-bit encryption”, then this is a finding. Warning: Microsoft warns that setting these may prevent the client from communicating with legacy servers that do not support them. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Control\Lsa\MSV1_0\ Value Name: NTLMMinServerSec Value Type: REG_DWORD Value: 0x20080000 (537395200) Warning: “Require NTLMv2 session security” will prevent authentication, if the “Network security: LAN Manager Authentication level” is set to permit NTLM or LM authentication. Documentable Explanation: If the required settings must be modified to support operation in a mixed Windows environment, then this should be documented with the IAO.

Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network security: Minimum session security for NTLM SSP based (including secure RPC) servers” to “Require NTLMv2 session security”, ”Require 128-bit encryption (all options selected).

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